在postgres中創建一個樞軸點

Question

我正在使用postgres RDBMS並希望在此上進行轉換。

如何在postgres中調整結果？

當我exe文件下面的查詢我得到這樣的結果

我發佈之前試過這個！

select * from 
(
select count(tnx_id) as x, 
case act_dt between 20140301 and 20140831 then '0-6 m' 
when act_dt between 20130901 and 20140231 then '7-12 m' 
when act_dt between 20130301 and 20130831 then '13-18 m' 
else '18+' 
end as act_bucket, 

case when tnx_dt_int between 20140301 and 20140831 then '0-6 m' 
when tnx_dt_int between 20130901 and 20140231 then '7-12 m' 
when tnx_dt_int between 20130301 and 20130831 then '13-18 m' 
else '18+' 
end as tnx_bucket 



from card 
inner join tnx on card_id=tnx_cardh_id 
group by act_bucket,tnx_bucket) 
x1 
pivot(x) 
(
for tnx_bucket in([0-6 m],[7-12 m],[13-18 m],[18+]) 
) 



so that i get like this 

       act_bucket 
tnx_bucket 0-6 m 7-12 m 13-18 m 18+ 
0-6m   < here filled with Count(tnx_id)  > 
7-12 m 
13-18 m 
18+ 

Answer 1

你正在尋找的tablefunc postgreSQL module

crosstab功能這是它的一個例子（從DOC）：

CREATE TABLE ct(id SERIAL, rowid TEXT, attribute TEXT, value TEXT); 
INSERT INTO ct(rowid, attribute, value) VALUES('test1','att1','val1'); 
INSERT INTO ct(rowid, attribute, value) VALUES('test1','att2','val2'); 
INSERT INTO ct(rowid, attribute, value) VALUES('test1','att3','val3'); 
INSERT INTO ct(rowid, attribute, value) VALUES('test1','att4','val4'); 
INSERT INTO ct(rowid, attribute, value) VALUES('test2','att1','val5'); 
INSERT INTO ct(rowid, attribute, value) VALUES('test2','att2','val6'); 
INSERT INTO ct(rowid, attribute, value) VALUES('test2','att3','val7'); 
INSERT INTO ct(rowid, attribute, value) VALUES('test2','att4','val8'); 

SELECT * 
FROM crosstab(
    'select rowid, attribute, value 
    from ct 
    where attribute = ''att2'' or attribute = ''att3'' 
    order by 1,2') 
AS ct(row_name text, category_1 text, category_2 text, category_3 text); 

row_name | category_1 | category_2 | category_3 
----------+------------+------------+------------ 
test1 | val2  | val3  | 
test2 | val6  | val7  | 
(2 rows) 

祝你好運！